mycom 4032MSC

2201Q4JE-MY-C9-N_2018.01.
Table of Contents
Compound 2-stage Screw Compressor 4032**C
vi
2.5 Mechanisms ................................................................................................. 2-9
2.5.1 Basics of the Screw Compressor ........................................................................ 2-9
2.5.2 Suction Process ................................................................................................... 2-9
2.5.3 Compression Process ........................................................................................ 2-10
2.5.4 Discharge Process ............................................................................................. 2-10
2.5.5 About Volume Ratio (Vi) .................................................................................... 2-10
2.5.6 Capacity Control Mechanism ............................................................................. 2-12
2.5.7 Bearing and Balance Piston .............................................................................. 2-12
2.5.8 Shaft Seal .......................................................................................................... 2-12
2.6 Gas and Oil Flow ........................................................................................ 2-13
Chapter 3 Installation
3.1 General Precautions for Installation .......................................................... 3-1
3.2 Installation Works ........................................................................................ 3-1
3.2.1 Unpacking ............................................................................................................ 3-1
3.2.2 Storage ................................................................................................................ 3-1
3.2.3 Transportation ...................................................................................................... 3-1
3.2.4 Preparation for Installation ................................................................................... 3-4
3.2.5 Installation ............................................................................................................ 3-5
3.2.5.1 Installation .................................................................................................... 3-5
3.2.5.2 Shaft Alignment between the Compressor and Driving Machine ................ 3-5
3.2.5.3 Piping Connection ....................................................................................... 3-6
3.2.5.4 Equipment and Devices for Protection of the Compressor ......................... 3-6
3.2.6 Airtightness Test .................................................................................................. 3-7
3.2.7 Lubricating Oil Charge ......................................................................................... 3-7
3.2.7.1 Initial Charge of Lubricating Oil ................................................................... 3-7
3.2.7.2 Additional Charge of Lubricating Oil ............................................................ 3-7
3.2.8 Charge of Refrigerant .......................................................................................... 3-7
3.2.9 Check after Installation ........................................................................................ 3-7
Chapter 4 Compressor and Package Unit Operation
4.1 Lubricating Oil (Refrigerant Oil) ................................................................. 4-1
4.1.1 Precautions for Selecting the Lubricating Oil....................................................... 4-1
4.1.2 Change of Lubricating Oil Brand ......................................................................... 4-1
4.1.3 Precautions for Handling lubricating Oil .............................................................. 4-2
4.1.3.1 Precautions for Handling Polyalkylene Glycol (PAG) .................................. 4-2
4.1.3.2 Precautions for Handling Polyolester (POE) Oil .......................................... 4-2
4.1.4 Lubricating Oil Management Criteria ................................................................... 4-3
4.1.5 Lubricating Oil Replacement Timing .................................................................... 4-4
4.1.5.1 After Starting the Initial Operation ............................................................... 4-4
4.1.5.2 During Normal Operation............................................................................. 4-4
4.2 Precautions for Operation ........................................................................... 4-5
4.2.1 Prevention of Liquid Flow-back Operation ........................................................... 4-5
4.2.2 Purging of Non-Condensable Gases ................................................................... 4-5
4.3 When Stopping the Compressor for a Long Time .................................... 4-6